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Theorem relcnvfi 6822
Description: If a relation is finite, its converse is as well. (Contributed by Jim Kingdon, 5-Feb-2022.)
Assertion
Ref Expression
relcnvfi  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  e.  Fin )

Proof of Theorem relcnvfi
StepHypRef Expression
1 dfrel2 4984 . . . . 5  |-  ( Rel 
A  <->  `' `' A  =  A
)
21biimpi 119 . . . 4  |-  ( Rel 
A  ->  `' `' A  =  A )
32adantr 274 . . 3  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' `' A  =  A
)
4 simpr 109 . . 3  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  A  e.  Fin )
53, 4eqeltrd 2214 . 2  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' `' A  e.  Fin )
6 relcnv 4912 . . . 4  |-  Rel  `' A
7 cnvexg 5071 . . . 4  |-  ( A  e.  Fin  ->  `' A  e.  _V )
8 cnven 6695 . . . 4  |-  ( ( Rel  `' A  /\  `' A  e.  _V )  ->  `' A  ~~  `' `' A )
96, 7, 8sylancr 410 . . 3  |-  ( A  e.  Fin  ->  `' A  ~~  `' `' A
)
109adantl 275 . 2  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  ~~  `' `' A
)
11 enfii 6761 . 2  |-  ( ( `' `' A  e.  Fin  /\  `' A  ~~  `' `' A )  ->  `' A  e.  Fin )
125, 10, 11syl2anc 408 1  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  e.  Fin )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1331    e. wcel 1480   _Vcvv 2681   class class class wbr 3924   `'ccnv 4533   Rel wrel 4539    ~~ cen 6625   Fincfn 6627
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-sep 4041  ax-pow 4093  ax-pr 4126  ax-un 4350
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2000  df-mo 2001  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-ral 2419  df-rex 2420  df-v 2683  df-sbc 2905  df-un 3070  df-in 3072  df-ss 3079  df-pw 3507  df-sn 3528  df-pr 3529  df-op 3531  df-uni 3732  df-br 3925  df-opab 3985  df-mpt 3986  df-id 4210  df-xp 4540  df-rel 4541  df-cnv 4542  df-co 4543  df-dm 4544  df-rn 4545  df-res 4546  df-ima 4547  df-iota 5083  df-fun 5120  df-fn 5121  df-f 5122  df-f1 5123  df-fo 5124  df-f1o 5125  df-fv 5126  df-1st 6031  df-2nd 6032  df-er 6422  df-en 6628  df-fin 6630
This theorem is referenced by:  funrnfi  6823  fsumcnv  11199
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